Snubbed truck



sept. 14, 194s.

L. A. LEHRMAN SNUBBED TRUCK Filed Jan. 1, 1945.

ION w www IN VEN TOR.

Patented Sept. 14, 1948 SNUBBED TRUCK Leo A. Lehrman, Chicago, lll.,asslgnor to American Steel Foundries, Chicago, Ill., a corporationof'New Jersey Application January 1, 1945, Serial No. 570,842

2 9 Claims. (Cl. 10S-197) My invention relates to a well known type ofrailway car truckI having quick wheel change and snubbed features suchas described in copending Light application Serial No. 436,731. whichhas since matured into U. S. Patent No. 2,378,414, granted June 15,1945.

The general object of my invention is to devise such a railway car truckwherein suitable control means will be associated with the frictionshoes to insure substantially constant frictional bearing of the shoesagainst the side frame columns throughout the life of the shoe andwithin the range of wear permitted on the friction parts.

A more specific objectof my invention is to devise a railway car trucksuch as that described wherein friction shoes may be mounted at eachside of each bolster end, each shoe being in wedge engagement with abolster wall and in frictional engagement with the side frame column andwherein resilient means may beso associated with friction shoes as toinsure simultaneous and sufilcient bearing against the column and thebolster wedge surfaces.

In one modification I have illustrated a plurality of resilient meansassociated with each shoe for accomplishing this purpose andv in anothermodification I have illustrated certain resilient means associated withboth shoes and other resilient means independently associated with eachshoe.

In the drawings. Figure 1 is a fragmentary side `elevation of a railwaycar truck embodying my invention, the view being shown partly in sectionin order more clearly to illustrate the arrange- View being takenapproximately in the planes indicated by the line 2--2 of Figure 1.

Figure 3 is a fragmentary sectional view through the bolster in the sameplane as the lsectional view of Figure 1, showing the manner of mountingtherein one of the resilient means and its associated spring plate.

Figure 4 is a further fragmentary sectional View comparable to thatshown in Figure 1, illustrating a modified form of my invention.

In each of the views only one half oi the bolster v and side framestructures are shown inasmuch as the arrangement is similar at oppositeends and opposite sides of the truck.

Referring first to the modiilcation illustrated in Figures 1 to 3, theside frame is of well known truss type having the compression member 2,the tension member 4, and the column 6, thebolster opening 8, thebolster I0 spring-supported as at l2 from resilient meansdiagrammatically indicated at I4, I4, said resilient means beingpositioned as at IB on the spring seat portion of the tension member inwell known manner.

The end portion of the bolster I0 may be of box section having a topwall I 8, a bottom wall 2o, a side wall 22, a center rib 24, and thespaced transverse webs 2B and 28 (Figure 2) defining with said top andbottom walls a friction shoe pocket 30 at each side of the bolster end,the adjacent side wall being cored away intermediate the webs 26 and 28.The bolster l0 may have the usual inboard and outboard column guides 3land 33. Within each pocket 30 may be mounted a friction shoe 32, acuplike structure of generally rectangular form having the verticalfriction wall 34 bearing as at 36 against the wear plate 38 convenientlymounted on the intermediate guide portion of the adjacent column 6.Within each friction shoe 32 may be housed an auxiliary spring 40, thelower end oi said spring being seated as at 42 on the bottom wall ofsaid shoe and the upper end thereof bearing against the bolster top walli8 at the top of the pocket 30. The friction shoe 32 is formed in wellknown manner with a lateral Iportion or wing at each side thereof, thelower surface of each wing being diagonally formed to afford a bearingas at 44 against the adjacent ledge 46formed as an integral part of eachof the transverse Webs 26 and 28. Each ledge 45 is slightly crowned, asWell appears in Figure 3, in order to permit some .rocking action of theshoe Ias it seats on the spaced ledges, such rocking action beingnecessary in order to accom-` modate some tilting movement of thebolster with respect to the side frame while permitting the frictionwall 34 to have full bearing against the adjacent column. The rear wallof lthe friction shoe 34 projects between the spaced ledges 46, 46

and may bear as at 48 against the central portion` of the spring plateor spring seat 50, saidspring seat extending longitudinally of thebolster, as clearly shown in the top plan view of Figure 2, in order toafford bearing for the full length of the resilient pad 52, one face ofwhich may be vulcanized thereto. The opposite face of the rubber blockor"resilient pad 52 may bea-r against the center rib 24 and verticalexpansion of said member 52 may be restricted by its bea-ring againstthe top and bottom walls of the bolster, as well seen in Figure 1, Aportion of the center .rib 24 i may be cored away to form therein alongitudinal sloti "(Figure 2) to accommodate flow of the member 52under compression.

'I'he configuration of the resilient member 52 and its position withinthe bolster prior to assembly of the friction shoe in the pocket is wellshown in the fragmentary view of Figure 3. It will be seen that someclearance is afforded above and below the distortable block or pad 52,and likewise, the slot 54 affords additional space for such distortionand in suchdirection that the blocks at opposite sides of the truckmight bear against eachother under conditions of maximum distortion orflow of the resilient material. This member 52 will be subject to acertain amount of compression as soon as the friction shoe is mounted inthe bolster end and assembled into operative position in abutment withthe adjacent side frame column. The amount of compression of'the member52 will vary as the bolster moves laterally between the side framecolumns and as wear of the friction face of the shoe takes place againstthe friction face of the column,

v In this arrangement, the spring 40 is under such compression as tomaintain the friction shoe 32 at all times seated against the spacedledges 46, 415, urging the shoe downwardly into wedge engagementtherewith and maintaining the friction wall 36 in engagement with theadjacent column. At the same time the resilient pad 52 is afforded suchcharacteristics as will constantly urge the frction shoe outwardly andmaintain it in a substantially vertical position regardless of suchtilting action of the bolster as may be permitted within the existingtolerances under service conditions. The pad 52 is so formed as t-oafford bearing against substantially the full vertical height of thefriction shoe at the back thereof, as well illustrated in Figure 1, andthe upper and lower edges of the member 52 are brought into such bearingwith the top and bottom walls of the bolster as at 5B and 58. It will benoted that the shoe is maintained in a central position between thewalls 26 and 28 of the pocket by the pad 52 being placed in shear ltoyieldably resist lateral and vertical movement ofthe shoe in thebolster.

In the modification illustrated in Figure 4 the side frame' andbolsterand friction shoe structure is substantially the same as thatofthe modification previously described except for the conguration ofthe rear wall of the friction shoe. In the modification of Figure 4 theside frame column |02 is afforded a wear plate |04 against which mayseat as at |06 the friction wall |08 of the shoe generally designatedH0, said shoe having the general form of the previous modification witheach lateral wing portion bearing as at ||2 against the bolster ledgei4. As in the previous modification, Ithe friction shoe houses acompression spring H6, the lower end of which may seat as at ||8 againstthe bottom wall of the friction shoe and the upper end as at |20 againstthe Itop wall |22 of the bolster generally designated |24.

The form of the friction shoe 0 differs from .that of the previousmodification in that the back wall has on the outer face thereof theround lug |26 affording positioning means for the compression spring |28which may bear as at |30 against the rear wall of the friction shoe.Said spring |28 may extend through an opening cored in the bolstercenter rib |32 and the opposite end thereof may bear as at |34 againstthe friction shoe |38, similarly mounted at the opposite side of thebolster.

In the modification .of Figure 4, it will be apparent that the frictionshoesare'urged laterally of the bolster by the compression spring |28compressed therebetween and extending laterally o! the bolster, saidspring |28 performing as a single unit the functionl performed by thetwo resilient members 52, 52 in the modification previously described.In the modification of Figure 4, the compression spring |28 will beunder such compression and have such a capacity as will be sufficient toprevent the friction shoe from ltilting away from the friction surfaceon the side frame column when relative movement of the bolster withrespect to the side frame might tend otherwise to tilt said shoes. Thespring |28 is afforded such diameter as to permit it to bear adjacentthe upperand lower edges of each friction shoe, as well i1- lustrated.At the same time, the compression spring IIB will be of such capacity asto maintain lthe wing portions of each friction shoe in engage-7 mentwith the ledges H4, H4 at each side thereof. thus preventing verticalplay between the bolster and the friction shoes housed therein.

It is to be understood that I do n-ot wish to be limited by the exactembodiments of the device shown which are merely by way of illustrationand not limitation as various and other forms of the device will, ofcourse, be apparent to those skilled in the art without departing fromthe spirit of the invention or the scope of the claims.

I claim:

1. In a railway car truck, a side frame having spaced columns, a bolstersupported on said frame with pockets adjacent said columns, a wedgesurface in each pocket, a friction shoe bearing on said surface andagainst the adjacent column, resilient means within each shoe compressedbe- 'tween a wall thereof and a `spaced wall of said bolster for urgingsaid shoe along said wedge surface and against the adjacent column, andresilient means interposed between the shoes in respective pockets andoperative to oppose movement of said shoes toward each other, saidlastmentioned resilient means comprising distortable blocks, each blockbearing against a plurality of angularly arranged walls of said bolster,and an opening in one of said bolster walls through which saiddistortable blocks may flow against each other.

2. In a railway car truck, a side frame having spaced columns definingin part a bolster opening, a bolster resiliently supported on said framebetween said columns, a pocket in each side of said bolster comprisingspaced ledges with wedge faces, a friction shoe in each pocketintermediate said ledges with means bearing on said faces, said shoehaving a wall engaging a friction surface on the adjacent column, and aplurality of resilient means associated with each shoe, one of saidresilient means being interposed between a wall of said shoe and aspaced wall of said bolster and the other of said resilient means beinginterposed between another wall of said shoeand a wall of said bolsterapproximately at right angles to said first-mentioned bolster wall.

3. In a railway car truck, a side frame having spaced columns definingin part a bolster opening, a bolster supported on said frame betweensaid columns, a pocket in each side of said bolster comprising spacedledges with wedge faces, a friction shoe in each pocket with meansbearing on said faces, said shoe having a wall engaging a fric- .tionsurface on the adjacent column, and a plurality of resilient meansassociated with each shoe, one of said resilient means being interposedbetween spaced horizontal walis of said shoe and said shoe and saidbolster.

' said bolster and the other of said resilient means being interposedbetween spaced vertical walls of 4. In a railway car truck. a side framehaving spaced columns defining Vin part a bolster opening. a bolstersupported on said frame between said columns, a pocket in each side ofsaid bolster comprisingu spaced ledges with wedge faces, a friction shoein each pocket intermediate said ledges with Ymeans bearing on saidfaces, said shoe having a wall engaging a friction surface on theadjacent column, and a plurality of resilientmeans associated with eachshoe, one of said resilient-means being housed within said shoe andcompressed between a wall of said shoe and a spaced wall of" saidbolster and the other of said resilient means be ing compressed betweenanother wall of said shoe and another wall of said bolster.

f fracasos' tively to urge sind shoe downwardly and laterally of saidbolster.

9. In a railway car truck, a side frame having. spaced columns definingin part a bolster opening, a bolster resiliently supported on said framebetween said columns, a pocket in each side of said bolster comprisingspaced ledges with coplanar wedge faces, a friction shoe in l eachpocket with means bearing `on said faces.

said shoe having a wall engaging a fric-tion surface on the adjacentcolumn, and a plurality v of resilient means associated with each shoeand 5. In a railway car truck, a side frame having spaced columns, abolster supported on said frame with pockets adjacent said columns, awedge surface in each pocket, a friction shoe bearing on said surfaceand against the adjacent column, resilient means within each shoecompressed between a wall thereof and a spaced wall of said bolster forreacting .against angularly arranged walls of said bolster, one of saidresilient means urging said shoe into wedge engagement with said facesand surface and the other of said resilient means urging said shoe intoengagementwith said surface.

10. In a railway car truck, a side frame having spaced columns definingin part a bolster opening. a bolster supported on said frame betweensaid columns, a pocket in each side of said bolster urging'said shoealong said wedgesurface and 6. In a railway car truck. a side framehavingspaced columns, a bolster supported on said frame with pocketsadjacent said columns, a wedge surface in each pocket, a friction shoebearing on said surface and against the adjacent column, `resilient meamwithin each shoe compressed between a wall thereof and a spaced wall ofsaid bolster for urging said shoe along said wedge surface and againstthe adjacent colummand resilient means interposed between the shoes inrespective pockets i them against said wedge surfaces and 'other of saidVresilient means being interposed between respective shoes and anintermediate wall of said bolster, and an opening in sai-d wall throughwhich said last-mentioned resilient means may flow to bear against eachother.

8. In a railway car truck, a side frame having spaced columns definingin part a bolster opening, a bolster resiliently supported on said framebetween said columns, a'pocket in each side of said bolster comprisingspaced ledges with'coplanar wedge faces, a friction shoe in each pocketintermediate said ledges with means bearing on comprising spaced ledgeswith coplanar wedge faces, a friction shoe in each pocket intermediatesaid ledges with means bearing on said faces and having a wall engaginga friction surface on the adjacent column, and a plurality of resilientmeans abutting each shoe and reacting against angularly arranged wallsof said bolster, one of said resilient means urging said shoe downwardlyand the other of said rasilient'means urging it outwardly of saidbolster.

, 1l. In a railway car truck, a side frame having spaced columns, abolster supported from said frame and having pockets adjacent saidcolumns,

- friction shoes in said pockets in wedge engagement between bolstersurfaces and said columns, and a plurali-ty of resilient meansassociated with said shoes, one of said resilient means bearing againstboth of said shoes .to urge themin opposite directions in a given planeand other of said resilient means being independently associated witheach shoe and reactive against an 'adjacent bolster wall to urge saidshoe in a direction angularly related .to said plane.

l2. In a railway car truck,` a side frame having spaced columns, abolster spring-j-supported on said frame with pockets adjacentrespective columns. friction shoes in said pockets in wedge engagementwith bolster walls in respective pockets and with said columns, andresilient means associated with said shoes, certain of said resilientmeans being compressed therebetween and other of said resilient meansbeing independently associated with respective shoes to urge -them intosaid wedge engagement, said last-mentioned resilient means being housedin respective shoes, and reacting against a horizontal bolster wall.

13. In a railway car truck, a side frame having -a column member with afriction surface, a bolster spring-supported from said frame with apocket adjacent said surface. spaced ledges in said pocket, a frictionshoe in wedge engagement with said ledgesl and having .a friction wallbearing against said surface, and a plurality of resilient meansassociated with said shoe and oriented in different directions andrespectively -compressed between said shoe and angularly arranged wallsof said bolster, one of said resilient means being housed in said shoe.

14. In a railway car truck, a side frame having a column with a frictionsurface, a bolster spring-supported from said frame and having a pocketadjacent said surface, spaced ledges -in said pocket having diagonallyarranged crowned faces, a friction shoe within said pocket and havface.

. accasionl ing means in wedge engagement with said faces and a wallengaging said surface. and a plurality of resilient means associatedwith said shoe and reacting against angularly arranged walls of saidbolster, one of said resilient means urging said shoe against said facesand the other Vof said resilient means urging said shoe against saidsur- 15. In a railway car truck, a side frame having spaced columns, abolster supported from said frame with pockets adjacent said columns,friction shoes in said pockets in wedge engagement between bolstersurfaces and said columns,

and a plurality of resilient means associated with said shoes, certainof said resilient means being Y independently associated with respectiveshoes to urge them in a vertical direction and other of said resilientmeans being operative .to urge said shoes in a horizontal direction.

16. In a railway car truck, a. side frame having spaced columns, abolster supported from said frame with pockets adjacent sal-d columns,friction shoes in said pockets in wedge engagement between bolstersurfaces and said columns, and a plural-ity of resilient meansassociated with said shoes, certain of said resilient means reactingagainst angularly arranged walls of-said bolster and being compressibleYby said shoes to engage each other and other of said resilient meansbeing housed in respective shoes and reacting against a common bolsterwall.

17. In a railway car truck, a side frame having spaced columns, abolster spring-supported on said frame with pockets adjacent respectivecolumns, fnlction shoes in said pockets in wedge engagement with bolsterwalls thereof and with said columns, and resilient means associated withsaid shoes, certain of said resilient means being positionedintermediate said shoes and compressible thereby to abut each other andother of said resilient means being independently associated withrespective shoes to urge them into engagement with said first-mentionedbolster walls and with said columns. certain of said resilient meansreacting against a horizontal wall of said bolster and other of saidresilient means reacting against a vertical wall and a horizontal wallthereof.

18. In a railway car truck, a side frame having spaced columns, abolster supported between said columns with pockets thereadjacent, apair of wedge surfaces in each pocket, a friction shoe vseated on eachpair of wedge surfaces in engagement with the adjacent column, andresilient means 'associated with sai-d shoes, certain of saidresilient'means being positioned intermediate said shoes andcompressible thereby to engage each other under certain operatingconditions and 8 ster walls and being associated with respective shoesfor urging them Aalong said surfaces.

20. In a railway car truck, a side frame having a column member with afriction surface, a boister supported from said frame with a pocketadjacent said surface, spaced diagonal ledges in said pocket, a frictionshoe in engagement with said ledges and having a friction wall bearingagainst said surface, and a plurality of resilient means associated withsaid shoe and oriented indifferent directions and respectivelycompressed between said shoe and angularly arranged walls of saidbolster.

21. In a railway car truck, a side frame having spaced columns, abolster supported from said frame with pockets adjacent said columns,friction shoes in said pockets in wedge engagement Ibetween bolstersurfaces and said columns, and

a plurality of resilient means associated with said shoes,l certain ofsaid resilient means being independently associated with respectiveshoes to urge them in a. vertical direction and other of said resilientmeans being operative to urge said shoes in a horizontal direction, saidlast-mentioned resilient means being positioned intermediate said shoesand reacting against each other under conditions of maximum compression.

22. In a railway car truck, a side frame having spaced columns, abolster spring-supported on said frame with pockets adjacent saidcolumns, friction shoes in said pockets in wedge engagement with bolsterwalls in respective pockets and l with said columns, and resilient meansassociated f with said shoes, certain of sai-d resilient means beotherof said resilient means being associated with respective shoes andoperative to urge said shoes along said wedge surfaces, s-ai-d certainresilient means reacting against angularly arranged walls of saidbolster land said other resilient means reacting against one of saidwalls.

19. In a railway car truck, a side frame having spaced columns, abolster supported between said columns with pockets adjacent thereto. apalir of wedge surfaces in each pocket, a friction shoe seated on eachpair of wedge surfaces, and resilient means associated withsaid shoes,certain of said resilient means reacting against angularly arrangedwalls ,of said bolster and being interposed between said shoes forurging them outwardly against said columns and other of said resilientmeans reacting ragainst one of said boling positioned intermediate saidshoes and under certain operating condi-tions compressible thereby toengage each other and other of said resilient means being independentlyassociated with respective shoes .to urge them into said wedgeengagement.

23. In a railway car truck, a side frame having spaced'columns, abolster spring-supported on said frame with pockets adjacent saidcolumns, friction shoes in said pockets in Wedge engagement with bolsterwalls in respective pockets and with said columns, and resilient meansassociated with sai-d shoes, certain of said resilient means beingpositioned intermediate said shoes'and under certain operatingconditions compressible thereby to engage each other and other of saidresilient means being independently associated with respective shoes tourge them into said wedge engagement, said last-mentioned resilientmeans being" housed in respective shoes and reacting against adjacentbolster walls.

24. In a railway car truck, a side frame, a bolster spring-supportedtherefrom, and friction means comprising a shoe wedged between theboister and a friction surface on the frame extending transverselythereof, and actuating means for said shoe comprising two independentsprings compressed between the bolster and the shoe and acting thereonin angularly related lines of force.

25. In a railway car truck, a side frame comprising spaced columns, abolster supported from ,said frame between said columns, a pocket insaid said pocket, and a plete interposed between said pad and said shoeportion and secured to said pad. said plate and said shoe portion havingengage-` ment along surfaces formed and arranged to place said pad inshear to yieldingly resist vertical and lateral movement of said shoe insaid pocket.

26. In aV railway car truck. a side frame comprising spaced .columnsdefining a bolster opening,

opening between said columns. and friction means comprising pockets inopposite sides of said bolster, friction shoes in respective pockets andl a bolster spring-supported from said frame in said shoes for urgingthe latter against respective colf umns.

27. In a railway car truck. a side iframe comprising a column, a bolsterspring-supported from said frame. a friction shoe in wedge engagementwith wedge means on the bolster and in frictional engagement with thecolumn along a surface extend-ing transversely of said frame. springmeans compressed between the bolster and the shoe for urging the latterinto said wedge engagement, and horizontal spring means independent ofthe rstmentioned spring means and compressed between the bolster and theshoe for urging the latter against said .column independently of saidwedge means.

30 Number.

28. In a railway car truck, a side frame. a bol'- ster spring-supportedtherefrom. a friction shoe s in wedge eng-agement with the bolster andin frlctional engagement with the frame along a sur- -iace extendingtransversely thereof. and actuating ,means for said shoe comprising twoindependent springs compressed thereagainst and against the bolster, oneof said springs acting horizon-tally on said shoe and the other actingvertically thereon.

29. In a railway car truck. a side frame comprising spaced columns, abolster spring-sup- -ported from said frame between said columns, andfriction means comprising pockets in opposite sides of said bolster,friction shoes in respective pockets wedged between said bolster andrespective columns, resilient means carried by the bolster and urgingsaid shoes to the wedged positions thereof, and horizontally actingspring means in dependent of said resilient means and housed within thebolster for urging each shoe against the adjacent column.

LEO A. LEHRMAN.

.REFERENCES CITED 'UNITED STATES PATENTS Name Date '2,129,408 DavidsonSenti 6. 1938 2,333,921 Flesch Nov.A 9, 1943

